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Derivative Instruments - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 03, 2016 USD ($) | Apr. 01, 2015 USD ($) derivative | Jul. 31, 2013 USD ($) | Sep. 30, 2017 USD ($) derivative | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) derivative | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) derivative | Jul. 31, 2016 USD ($) derivative | Jun. 01, 2016 | May 01, 2015
Derivative |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivative, ineffective portion |  |  |  | $ (37,000) |  | $ (82,000) |  |  |  |  |
Derivative assets |  |  |  | 6,250,000 |  | 6,250,000 |  | $ 5,935,000 |  |  |
Derivative liabilities |  |  |  | 819,000 |  | 819,000 |  | 1,303,000 |  |  |
Cash flow hedge adjustment |  |  |  |  |  | (1,100,000) |  |  |  |  |
Level 2 |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  |  |  | 6,250,000 |  | 6,250,000 |  | 5,935,000 |  |  |
Derivative liabilities |  |  |  | 819,000 |  | 819,000 |  | 1,303,000 |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  | 1,975,000,000 |  | $ 1,975,000,000 |  | 2,025,000,000 |  |  |
5 Year Term Loan due April 2020 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  | 5 years |  |  |  | 5 years |  |  |  |  |
Notes payable |  |  |  | 450,000,000 |  | $ 450,000,000 |  | 450,000,000 |  |  |
5 Year Term Loan due April 2020 | Unsecured Debt | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  | 2.75% |  | 2.66%
5 Year Term Loan due April 2020 | Unsecured Debt | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  | 3.65% |  | 3.56%
5 Year Term Loan due April 2020 | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.30% |  |  |  |  |
5 Year Term Loan due April 2020 | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.20% |  |  |  |  |
7 Year Term Loan Facility 2015 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  | 7 years |  |  |  |  |  |  |  |  |
Face amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
7 Year Term Loan Facility 2015 | Unsecured Debt | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  | 3.36% |  | 3.21%
7 Year Term Loan Facility 2015 | Unsecured Debt | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  | 4.31% |  | 4.16%
New Credit Agreement - Term Loan | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.30% |  |  |  |  |  |  |  |  |
New Credit Agreement - Term Loan | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.20% |  |  |  |  |  |  |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) | 7 years |  |  |  |  | 7 years |  |  |  |  |
Notes payable |  |  |  | $ 125,000,000 |  | $ 125,000,000 |  | $ 125,000,000 |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  | 3.03% |
7-Year Term Loan due November 2022 | Unsecured Debt | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  |  |  |  |  |  |  | 3.98% |
7-Year Term Loan due November 2022 | Unsecured Debt | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.60% |  |  |  |  |
7-Year Term Loan due November 2022 | Unsecured Debt | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.55% |  |  |  |  |
Met Park North |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  | 7 years |  |  |  |  |  |  |  |
Adjusted interest rate |  |  |  | 3.71% |  | 3.71% |  |  |  |  |
Notes payable |  |  | $ 64,500,000 |  |  |  |  |  |  |  |
Met Park North | LIBOR |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.55% |  |  |  |  |  |  |  |
Interest Rate Contract |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  | 2 |  |  |  |  |  |  |  |  |
Notional amount |  | $ 300,000,000 |  |  |  |  |  |  | $ 300,000,000 |  |
Interest Rate Contract | 5 Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  |  |  |  |  |  | 2 |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  | 1.36%
Interest Rate Contract | 7 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  | 1.61%
Unrealized gain (loss) on derivative, ineffective portion |  |  |  |  | $ 900,000 |  | $ (1,600,000) |  |  |  |
Interest Rate Contract | 7-Year Term Loan due November 2022 |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 125,000,000 |  |  |  |  |  |  |  |  |  |
Fixed interest rate | 1.43% |  |  |  |  |  |  |  |  |  |
Interest Rate Contract | Met Park North | LIBOR |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 2.16% |  |  |  |  |  |  |  |
Interest Rate Contract, Instrument A | 5 Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedge derivatives |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Interest Rate Swap | 7 Year Term Loan Facility 2015 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  | 2 |  |  |  |  |  |  |  |  |
Interest Rate Floor | 7-Year Term Loan due November 2022 | LIBOR |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Derivative, interest rate floor | 0.00% |  |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | LIBOR |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Derivative, interest rate floor |  |  |  |  |  |  |  |  | 0.00% |  |
Designated as Hedging Instrument | Interest Rate Cap |  |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  | 6 |  | 6 |  | 6 |  |  |
Notional amount of interest rate cash flow hedge derivatives |  |  |  | $ 839,500,000 |  | $ 839,500,000 |  | $ 839,500,000 |  |  |

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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